Volkswagen May Sweeten Bid
For Rolls-Royce Motor Cars

FRANKFURT -- Volkswagen AG's supervisory board gave its management approval to submit a sweetened bid for Rolls-Royce Motor Cars, putting more pressure on Bayerische Motoren Werke AG to raise its own offer.

Vickers PLC, which owns Rolls-Royce Motor Cars, agreed last month to sell the company to BMW. But the British company is free to reopen the bidding if it fails to come to terms with the German car maker this week. A four-week...